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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0d819cc8ec801805c0b2e0bc0a150454c0b9893961f65012fe690d9f936214' 
  AND token = 'rRXfx0btKRMjlYTVFTdAPivKU8Kb0Zfu67y2PI7cab8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}